[lkml]   [2012]   [Jan]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Bad SSD performance with recent kernels
2012/1/30 Eric Dumazet <>:
> Le lundi 30 janvier 2012 à 11:17 +0800, Shaohua Li a écrit :
>> 1M block size is slow, I guess it's CPU related.
>> And as for the big regression with newer kernel than 2.6.38, please
>> check if idle=poll
>> helps. CPU idle dramatically impacts disk performance and even latest
>> cpuidle governor
>> doesn't help for some CPUs.
> No change with idle=poll
I mean the big regression might be related to CPU idle. because I
saw really bad performance with CPU idle with some CPUs.

The 1M block size performance is lower than 128K is not. but I still
guess it's CPU related (like copy). The test result is always like this
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2012-01-30 06:47    [W:0.057 / U:76.800 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site